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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd75d2208031f7ccbcaeb01390da7b369f7e2dee30b7dd9d040d5798ea1b2c02a' 
  AND token = 'HkoUs5aXBJC+qU91l2BSLecuMeDuJgV57EAFZULhMBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}